Something’s rotten in the hamlet of Montauk.

Two agencies have a different take on what is happening over at Hamptons hotspot the Montauk Yacht Club — with one claiming the hotel was pumping sewage into the streets, while another says it was only stormwater. 

The luxury hotel, where rooms go for over $1,000 per night on the weekends, has been hosting jam-packed parties full of scenesters on Saturday nights at its restaurant, Showfish. 

Last week, local cops and code enforcement officers said the property was allegedly dumping sewage onto the grass and into the road.

We hear the poopoo, er popo, turned up when they got an anonymous tip. 

The Town Of East Hampton’s Director of Ordinance Enforcement, Kevin Cooper, tells Page Six that around 9:30p.m. on Aug. 19, code inspectors “observed sewerage being pumped from one of the property’s cesspools onto the grass and into the street area and drains.”

The dirty situation, he says, was acknowledged by a hotel worker.

The hotel is located on Lake Montauk, and luckily the water was “not observed being pumped into the lake.”

The Suffolk County Department of Health Services, however, had a different story when the agency turned up days later, telling Page Six that the drainage was only stormwater. 

“The Suffolk County Department of Health Services’ Bureau of Public Health Protection conducted an inspection Tuesday, August 22nd, and noted no sewage violations,” says their spokesperson. “The facility routinely pumps stormwater from the parking lot storm drain onto a grass strip on its property.”

The official further explained, “Stormwater is not classified as sewage, and is not required to be pumped into a sanitary system.”

Cooper, however, is standing by his report, noting his agency needs to notify the New York State Department of Environmental Conservation.

“That definitely wasn’t stormwater, it smelled atrocious,” he told us. “The police got a call for a smell. They said it smelled horrible.”

A rep for the hotel tells us, “On Saturday August 19th, an accumulation of rain runoff required us to remove excess rainwater, not wastewater, from our storm drain. The police investigated and no violations were issued.”

Last year, Gurney’s sold the hotel to Safe Harbor Marinas for a record breaking $149 million.

It was once a private club that counted members of the Vanderbilt, Astor and Whitney families as original members, according to Behind the Hedges.

Showfish ran into an issue with the cops in July when it faced a potential noise violation and overcrowding issue, but the hotel ended up shooing everyone out to avoid a citation.